Rotor Blade



Contact Person:

Dr.-Ing. Anne Jüngert


Nowadays wind energy rotor blades exceed the length of 60m. Composite materials offer enormous weight savings along with excellent fatigue properties. Wind power plants are under a high cost pressure. The materials have to be cost efficient hence easy to handle and manufacture.


The main components of rotor blades are a load carrying web-spar-structure and an aerodynamic shell.  Mainly applied systems are fiber glass reinforced epoxied based resins. The spar is bending loaded so it has a unidirectional lay-up. Web and shell are designed as a sandwich using balsa wood and foam cores. Manufacturing is mainly handwork. Process automation offers great potentials in quality control and cost reduction.


Various non-destructive test methods will be used on the rotor blades made of GFK and CFK:

  • Ultrasonic testing using through-transition and reflection
  • Local acoustic resonance spectroscopy (LARS)
  • Infrared thermography


Many of these methods were developed at the MPA University of Stuttgart for the rotor blade test. The above-mentioned methods can be used for quality management during the rotor blade manufac-turing process as well as for condition control on the structure.





Mechanized ultrasonic testing on a rotor blade Image: MPA Stuttgart